CN213078827U - Coal fired boiler strength soot blowing system takes flat horn shape down spray tube formula nozzle - Google Patents

Abstract

The utility model discloses a coal fired boiler strength blows grey system area flat horn shape lower spray tube nozzle, and the serious department of deposition carries out directional diffusion strength and blows grey in mainly used thermal power factory coal fired boiler level and the afterbody flue, can effectively solve coal fired boiler level and afterbody flue deposition problem. The nozzle includes cylindrical air chamber, air chamber head and flat tubaeform spray tube down, the one end of cylindrical air chamber is equipped with formula of sinking weld joint for connect compressed air or steam medium pipeline, the other end and the air chamber head of cylindrical air chamber weld mutually, the lateral wall of cylindrical air chamber evenly is equipped with four circular gas ports, circular gas port is located the upper portion of cylindrical air chamber, the spray tube welding just is located circular gas port department at the lateral wall of cylindrical air chamber under the flat tubaeform, the spray tube is horn column structure under the flat tubaeform. The utility model has the advantages of reasonable design, work safety, the design adopts flat tubaeform lower spray tube to come directional diffusion strength to blow the ash, can improve the strength and blow the soot effect of blowing the ash system.

Description

Coal fired boiler strength soot blowing system takes flat horn shape down spray tube formula nozzle

Technical Field

The utility model relates to a coal fired boiler strength blows grey system area flat horn shape lower spray tube nozzle, and the serious department of deposition carries out directional diffusion strength and blows grey in mainly used thermal power factory coal fired boiler level and the afterbody flue, can effectively solve coal fired boiler level and afterbody flue deposition problem.

Background

When a coal-fired boiler of a large-scale thermal power plant operates, a large amount of dust can be generated in horizontal and tail flues generally, and if the dust in the flues can not be taken away by flue gas in time, the situation that the dust is more and more serious can be caused, and the operation safety of the coal-fired boiler is damaged.

When a coal-fired boiler of a large-scale thermal power plant operates, ash is easily accumulated in horizontal and tail flues, the horizontal flue cannot be carried away by smoke due to the fact that smoke flows to form a negative pressure backflow area in a certain area, smoke turbulence and flowing dead angle areas exist in the tail flues, particularly at reducing positions, elbows and the like, and the smoke cannot be carried away by the smoke to form a large amount of ash. A large amount of dust in the flue firstly influences a flue gas flow field in the flue, so that the flue gas flow is uneven, and the local heat exchanger is scoured and worn; a large amount of deposited ash is accumulated on the surface of the heat exchanger, and the heat exchange of the heat exchanger is influenced; a large amount of dust is accumulated in the tail flue, so that flue collapse accidents can be caused, and the safe operation of the boiler is seriously influenced.

The conventional soot blowers on coal-fired boilers of thermal power plants respectively have advantages and disadvantages, such as steam soot blowers, sound wave soot blowers, gas pulse soot blowers and the like. The steam soot blowing effect is good, but soot blowing dead angles exist, and blowing damage is caused to a heat exchange surface; the acoustic soot blowing effect is limited; the pulse soot blower generates huge sound energy and a large amount of high-temperature and high-speed gas instantly, so that the soot is splashed and taken away along with the flue gas, but the heat exchange surface is oscillated, impacted and washed in a shock wave mode, and the three common soot blowers can not effectively remove the soot in horizontal, elbow and dead-angle flues.

At present, a pneumatic soot blowing system using steam or compressed air as a medium is demonstrated and applied to a coal-fired boiler, and the pneumatic soot blowing mode can effectively perform pneumatic soot blowing on an area where soot is easy to accumulate in a flue at fixed points and at fixed time, so that the accumulated soot is blown upwards and taken away by flue gas. The Chinese patent application with the publication number of CN107143867A discloses a soot blowing system and a soot blowing method for a horizontal flue of a boiler, wherein the system comprises a compressed air main pipe and a plurality of soot blowing units, and each soot blowing unit comprises a compressed air branch pipe, a manual gate valve, an electromagnetic valve, a pressure gauge, a plurality of blast caps and a plurality of abrasion-proof tiles. The nozzle is used as a key part, has a single structure, has dead corners in a soot blowing area, and has the problem of limited soot blowing effect.

In conclusion, the pneumatic soot blowing system can effectively solve the problem of soot deposition at dead corners of horizontal and tail flues of the coal-fired boiler. However, the nozzle is used as a key part, plays an important role in the pneumatic soot blowing effect, and has important significance in pertinently applying nozzles in different forms according to the characteristics of different flue soot deposits.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a structural design reasonable, work safety, design adopt under the flat tubaeform spray tube to come directional diffusion strength to blow the ash, improve the strength and blow the soot blowing effect of soot system, be used for improving thermal power factory coal fired boiler level and afterbody flue the strength blow the soot blowing system blow the flat tubaeform nozzle down of taking of soot ability.

The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a coal fired boiler strength soot blowing system takes flat tubaeform lower nozzle which characterized in that: including cylindrical air chamber, air chamber head and flat tubaeform spray tube down, the one end of cylindrical air chamber is equipped with formula of sinking weld joint for connect compressed air or steam medium pipeline, the other end and the air chamber head of cylindrical air chamber weld mutually, the lateral wall of cylindrical air chamber evenly is equipped with four circular gas ports, circular gas port is located the upper portion of cylindrical air chamber, the welding of flat tubaeform spray tube is just located circular gas port department at the lateral wall of cylindrical air chamber down, flat tubaeform spray tube is horn-shaped structure down.

Further, the air chamber end socket is of a circular structure.

Further, the one end of spray tube is circular air inlet under the flat tubaeform, the other end of spray tube is flat tubaeform spout under the flat tubaeform, the quantity of spray tube is four under the flat tubaeform.

Furthermore, the included angle between the central line of the flat horn-shaped lower spray pipe and the wall surface of the cylindrical air chamber is 45 degrees, and the nozzle of the flat horn-shaped lower spray pipe faces the direction of the wall surface or the heat exchange surface of the flue.

Furthermore, the nozzle section of the flat horn-shaped lower spray pipe is parallel to the direction of the wall surface or the heat exchange surface of the flue.

The soot blowing method comprises the following steps: compressed air or steam get into from cylindrical air chamber's formula of sinking welding mouth, in four circular gas ports flow out to flat horn shape lower spray tube, the medium flows out by the spout of flat horn shape lower spray tube, compressed air or steam medium carry out directional diffusion injection towards the direction of flue wall or heat-transfer surface through the spout of flat horn shape lower spray tube, blow up the deposition fluidization in the flue, four flat horn shape lower spray tube guarantee all around all-round sweep, flat horn shape lower spray tube directional diffusion efflux has strengthened the disturbance to the deposition, effectively solve the flue deposition and pile up the problem.

Furthermore, the lower spray pipe type nozzles with the flat trumpet shapes can be arranged in multiple groups in the ash deposition area of the flue according to the ash removal area and the serious condition.

Furthermore, the installation direction of the lower spray pipe type nozzle with the flat horn shape is that the central line of the cylindrical air chamber is vertical to the wall surface or the heat exchange surface of the flue.

Furthermore, the mounting height of the lower spray pipe type nozzle with the flat horn shape is flexibly adjusted according to the height of dust deposition in the flue, and the mounting maximum height is 500mm away from the wall surface or the heat exchange surface of the flue.

Compared with the prior art, the utility model, have following advantage and effect:

1. the lower spray pipe type nozzle with the flat horn shape can carry out directional diffusion soot blowing aiming at the characteristic of soot deposition in a flue, and can effectively solve the soot deposition problem in dead corners and serious soot deposition areas of the flue of the coal-fired boiler.

2. Take spray tube formula nozzle under flat horn shape to adopt novel structural design, work safety, the design adopts takes flat horn shape spray tube to come directional diffusion strength to blow the ash down, convenient to use, market prospect is wide.

3. The design of the lower spray pipe type nozzle with the flat horn shape adopts a directional diffusion injection mode to improve the soot blowing effect of the pneumatic soot blowing system and improve the capacity of the soot blowing system.

4. The medium sprayed out by the four flat horn-shaped lower spray pipes of the lower spray pipe type nozzle with the flat horn-shaped lower spray pipes forms a directional diffusion compressed air or steam jet flow field, accumulated dust in a flue is blown up and fluidized, the nozzles are guaranteed to be blown and blown in an all-directional mode through jet flow of the four horn-shaped spray nozzles, disturbance to the accumulated dust is enhanced through the directional diffusion jet flow, and the problem that the accumulated dust in the flue is accumulated is effectively solved.

Drawings

Fig. 1 is a schematic front view of a lower nozzle with a flat horn shape according to an embodiment of the present invention.

Fig. 2 is a schematic sectional view of the plane B-B in fig. 1.

In the figure: the device comprises a cylindrical air chamber 1, an air chamber end enclosure 2, a flat horn-shaped lower spray pipe 3, a sunken welding port 4 and a circular air port 5.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Examples are given.

Referring to fig. 1 to 2, in this embodiment, a coal fired boiler air soot blowing system takes flat horn shape lower spray pipe type nozzle, including cylindrical air chamber 1, air chamber head 2 and flat horn shape lower spray pipe 3, the one end of cylindrical air chamber 1 is equipped with sunken welding mouth 4, be used for connecting compressed air or steam medium pipeline, the other end of cylindrical air chamber 1 welds with air chamber head 2, the lateral wall of cylindrical air chamber 1 evenly is equipped with four circular gas ports 5, circular gas port 5 is located the upper portion of cylindrical air chamber 1, flat horn shape lower spray pipe 3 welds at the lateral wall of cylindrical air chamber 1 and is located circular gas port 5 department, flat horn shape lower spray pipe 3 is the tubaeform structure.

In this embodiment, the gas chamber end enclosure 2 is a circular structure.

In this embodiment, one end of the flat horn-shaped lower nozzle 3 is a circular air inlet, the other end of the flat horn-shaped lower nozzle 3 is a flat horn-shaped nozzle, and the number of the flat horn-shaped lower nozzles 3 is four.

In this embodiment, the included angle between the central line of the flat horn-shaped lower nozzle 3 and the wall surface of the cylindrical air chamber 1 is 45 degrees, and the nozzle of the flat horn-shaped lower nozzle 3 faces the direction of the flue wall surface or the heat exchange surface.

In this embodiment, the nozzle cross-section of the flat horn-shaped lower nozzle 3 is parallel to the direction of the flue wall surface or the heat exchange surface.

In the embodiment, a plurality of groups of the lower spray pipe type nozzles with the flat trumpet shapes can be arranged in the ash deposition area of the flue according to the ash removal area and the serious condition.

In this embodiment, the installation direction of the lower nozzle with the flat horn-shaped nozzle is that the central line of the cylindrical air chamber 1 is perpendicular to the wall surface or the heat exchange surface of the flue.

In the embodiment, the mounting height of the lower spray pipe type nozzle with the flat horn shape is flexibly adjusted according to the height of dust deposition in the flue, and the mounting maximum height is 500mm away from the wall surface or the heat exchange surface of the flue.

The pneumatic soot blowing system of the coal-fired boiler is provided with a flat horn-shaped lower spray pipe type nozzle in the horizontal and tail flue soot accumulation areas of the coal-fired boiler, compressed air or steam enters from a sunken welding port 4 of a cylindrical air chamber 1 and flows out of four circular air ports 5 into a flat horn-shaped lower spray pipe 3, a medium flows out of a nozzle of the flat horn-shaped lower spray pipe 3, the compressed air or the steam medium is subjected to directional diffusion injection towards the direction of a flue wall surface or a heat exchange surface through the nozzle of the flat horn-shaped lower spray pipe 3, soot in a flue is blown and fluidized, the four flat horn-shaped lower spray pipes 3 ensure all-around blowing, the disturbance to the soot is enhanced through the directional diffusion jet of the flat horn-shaped lower spray pipe 3, and the problem of soot accumulation of the flue soot is effectively solved.

In the embodiment, the soot blowing medium adopted by the lower spray pipe type nozzle with the flat horn shape is compressed air or steam with the pressure of 0.8-1MPa, and the consumption and the pressure of the compressed air or the steam are ensured.

In the embodiment, the lower spray pipe type nozzle with the flat horn shape adopts a discontinuous soot blowing mode, and the blowing is carried out for 3 minutes each time and 5 minutes each time.

Those not described in detail in this specification are well within the skill of the art.

Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.

Claims (6)

1. The utility model provides a coal fired boiler strength soot blowing system takes flat tubaeform lower nozzle which characterized in that: spray tube (3) under cylindrical air chamber (1), air chamber head (2) and flat tubaeform, the one end of cylindrical air chamber (1) is equipped with sunken formula weld joint (4) for connect compressed air or steam medium pipeline, the other end and air chamber head (2) of cylindrical air chamber (1) weld mutually, the lateral wall of cylindrical air chamber (1) evenly is equipped with four circular gas ports (5), circular gas port (5) are located the upper portion of cylindrical air chamber (1), spray tube (3) welding just is located circular gas port (5) department at the lateral wall of cylindrical air chamber (1) under the flat tubaeform, spray tube (3) are horn-shaped structure under the flat tubaeform.

2. The coal-fired boiler air soot blowing system of claim 1 with flat horn-shaped lower nozzle, characterized in that: the air chamber end enclosure (2) is of a circular structure.

3. The coal-fired boiler air soot blowing system of claim 1 with flat horn-shaped lower nozzle, characterized in that: the one end of spray tube (3) is circular air inlet under the flat tubaeform, the other end of spray tube (3) is flat tubaeform spout under the flat tubaeform, the quantity of spray tube (3) is four under the flat tubaeform.

4. The coal-fired boiler air soot blowing system of claim 1 with flat horn-shaped lower nozzle, characterized in that: the included angle between the central line of the flat horn-shaped lower spray pipe (3) and the wall surface of the cylindrical air chamber (1) is 45 degrees, and the nozzle of the flat horn-shaped lower spray pipe (3) faces the direction of the wall surface or the heat exchange surface of the flue.

5. The coal-fired boiler air-blowing system of claim 1 or 4 with flat horn-shaped lower nozzle, characterized in that: the nozzle section of the flat horn-shaped lower nozzle (3) is parallel to the direction of the wall surface or the heat exchange surface of the flue.

6. The coal-fired boiler air soot blowing system of claim 1 with flat horn-shaped lower nozzle, characterized in that: the central line of the cylindrical air chamber (1) is vertical to the wall surface or the heat exchange surface of the flue.

Images